Mechanical calculating apparatus for adding,subtracting,multiplying and dividing

ABSTRACT

A calculating machine for executing addition, subtraction, multiplication and division wherein a number set into the machine is printed as an effective number in accordance with the decimal orders of the calculating machine for visual observation in addition or subtraction characterized by the provision of a dividend introduction mechanism and by that after setting a dividend in a pin box and depressing a division ( divided by ) key: 1. A TYPE BAR IS MOVED UPWARDLY IN THE FIRST HALF ROTATION OF THE FIRST ROTATION OF A MAIN SHAFT WITHOUT TRANSFERRING THE DIVIDEND TO AN ACCUMULATOR SO THAT THE DIVIDEND IS PRINTED IN SUCH A MANNER THAT THE LEAST SIGNIFICANT DIGIT OF THE EFFECTIVE NUMBER REPRESENTING THE FIRST DECIMAL ORDER OF THE DIVIDEND COINCIDES WITH A POSITION OF THE LEAST SIGNIFICANT DIGIT OF AN EFFECTIVE NUMBER IN ADDITION OR SUBTRACTION; 2. IN THE LAST HALF OF SAID FIRST ROTATION OF SAID MAIN SHAFT, SAID PIN BOX IS SHIFTED IN SUCH A MANNER THAT THE MOST SIGNIFICANT DIGIT OF THE DIVIDEND SET IN SAID PIN BOX MAY BE TRANSFERRED TO A POSITION OF THE MOST SIGNIFICANT DIGIT OF A NUMBER OR TOTAL IN SAID ACCUMULATOR; 3. DURING THE SECOND ROTATION OF SAID MAIN SHAFT, THE DIVIDEND IS OPPOSED TO INTO SAID ACCUMULATOR IN SUCH A MANNER THAT THE MOST SIGNIFICANT DIGIT OF THE DIVIDEND IS TRANSFERRED IN THE MOST SIGNIFICANT DIGIT OF THE NUMBER OR TOTAL IN SAID ACCUMULATOR; AND 4. DURING THE SECOND ROTATION OF SAID MAIN SHAFT, CAUTION PINIONS ARE CLEARED AND RESET TO ZEROS.

United States Patent McGourty [s4] MECHANICAL CALCULATING APPARATUS FORADDING, SUBTRACTING, MULTIPLYING AND DIVIDING [72] Inventor: Thomas K.McGourty, Aptos, Calif.

[73] Assignee: Kabushiki Kaisha Ricoh, Tokyo,

Japan [22] Filed: Aug. 19, 1969 [21] Appl. No.: 851,182

[30] Foreign Application Priority Data Aug. 20, 1968 Japan All/59480[52] U.S. Cl ..235/63 G, 235/60 P [51] Int. Cl.....G06c 23/00, G06C11/04, G066 19/04 [58] Field of Search...235/63, 221, 63 G, 63 E, 63 F,235/60 P, 58 P [56] References Cited UNITED STATES PATENTS 2,821,3421/1958 Capellaro ..235/60 2,956,742 10/1960 Colvin ..235/63 3,097,7907/1963 Julick ..235/63 3,140,823 7/1964 Kuhn ..235/6O PrimaryExaminer-Stephen J. Tomsky Attorney-Burgess, Ryan & Hicks [57] ABSTRACTA calculating machine for executing addition, subtraction,multiplication and division wherein a number set into the machine isprinted as an effective number in accordance with the decimal orders ofthe calculating machine for visual observation in addition orsubtraction characterized by the provision of a dividend introductionmechanism and by that after setting a dividend in a pin box anddepressing a division key:

1. a type bar is moved upwardly in the first half rotation of the firstrotation of a main shaft without transferring the dividend to anaccumula tor so that the dividend is printed in such a manner that theleast significant digit of the effective number representing the firstdecimal order of the dividend coincides with a position of the leastsignificant digit of an effective number in addition or subtraction;

2. in the last half of said first rotation of said main shaft, said pinbox is shifted in such a manner that the most significant digit of thedividend set in said pin box may be transferred to a position of themost significant digit of a number or total in said accumulator;

3. during the second rotation of said main shaft, the dividend isopposed to into said accumulator in such a manner that the mostsignificant digit of the dividend is transferred in the most significantdigit of the number or total in said accumulator; and

4. during the second rotation of said main shaft,

caution pinions are cleared and reset to zeros.

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1. A calculating machine for executing addition, subtraction,multiplication and division wherein a number set into the machine isprinted as an effective number in accordance with the decimal orders ofthe calculating machine for visual observation in addition orsubtraction, comprising a. a pin box having a plurality of movable pinstherein, b. means for setting a number in said pin box, c. meanssupporting said pin box for shifting movement, d. means for printing anumber set in said pin box, e. accumulator means for numbers set in saidpin box, said accumulator means comprising pinions, f. caution pinionmeans, g. means for transferring numbers set in said pin box to saidaccumulator means, said means comprising racks having heels engageablewith set pins of said pin box, the pinions of the accumulator meansbeing engageable by said racks, h. means for transferring numbers set insaid pin box to said caution pinion means, i. means for preventing thetransfer of numbers from said pin box to said accumulator means, j. mainshaft means, k. keyboard means including division key means, m. meansresponsive to movement of said division key means for effecting a firstrevolution of said main shaft means for actuating said pin box to set anumber in said pin box and to prevent such transfer of the nUmber to theaccumulator means, for causing printing of the number set in said pinbox with the least significant digit of an effective number of thedividend coinciding with the least significant digit of the effectivenumber representing the first decimal order in addition or subtraction,and for thereafter permitting transfer of the number from said pin boxto said accumulator means, n. means responsive to the completion of saidfirst revolution of said main shaft to cause a second revolutionthereof, and o. means responsive to the second revolution of said mainshaft for shifting said pin box to a higher digit for preventingprinting of the number set in said pin box, for stopping said pin box ina position in which the most significant digit of the effective numberof the dividend is opposed to the most significant digit set in saidaccumulator means, for setting said caution pinions to zero, and forpreventing the setting of a number in said caution pinions.
 2. Acalculating machine as claimed in claim 1, wherein said means forpreventing the transfer of numbers from said pin box to said accumulatormeans comprises a non-addition plate, a lift lever for lifting saidnon-addition plate, and means engaged by said non-addition plate forremoving the pinions of said accumulator means from engagement with theracks of said means for transferring numbers set in said pin box to saidaccumulator means.
 3. A calculating machine as claimed in claim 1,wherein the racks of said means for transferring numbers set in said pinbox to said accumulator means are engageable with said caution pinionmeans.
 4. A calculating machine as claimed in claim 1, wherein saidmeans for printing a number set in said pin box comprises main rackshaving heels engageable with set pins of said pin box and type bar meanscarried by said racks.
 5. A calculating machine as claimed in claim 1,wherein said means for stopping said pin box in a position in which themost significant digit thereof is opposed to the most significant digitof said printing means comprises a division set slide plate, means formoving said division set slide plate, and means movable with said pinbox for abutting said division set slide plate in one position thereof.6. A calculating machine as claimed in claim 5, further comprising meansfor pushing zero pins of said pin box which are lower than a digit settherein, and wherein said means for moving said division set slide plateactuates said means for pushing zero pins.